Scientific Aiverican, AvucusT 8, 1891.] … ‘Thermopiles, and of the Materials and Processes used in every Department of the Art. Translated from the PNEUMATIC BELL OUTFIT German of Dr. George Langbein, with additions by Wil- Geo. M. Hopkins. liam T. Brannt, editor of the “ Techno-Chemical Receipt Book.” Illustrated by 125 Engravings. In one…
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